<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入BB内容" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_time">
                <div class="cmt-title">
                    第{{i+1}}楼&nbsp;&nbsp;用户：{{item.user_name}}&nbsp;&nbsp;发表时间：{{item.add_time | dateFormat}}
                </div>
                <div class="cmt-body">
                    {{item.content=== 'undefined'?'此用户很懒':item.content}}
                </div>
            </div>
        </div>
        <mt-button type="danger" size="large" plain @click="getmore">加载更多</mt-button>

    </div>
</template>
<script>
import {Toast} from 'mint-ui'
export default {
    data(){
        return {
            pageIndex:1,// 默认展示 第一页数据
            comments:[],// 所有评论数据
            msg:''//评论输入的内容
        }
    },
    created(){
        this.getcomment()
    },
    methods:{
        getcomment(){//获取评论
            this.$http.get('api/getcomments/'+this.id+'?pageindex='+this.pageIndex)
            .then(result =>{
                if(result.body.status ===0)
                {
                    // this.comments = result.body.message;
                    // 每当获取新评论数据 ，进行数组拼接，   concat
                    this.comments = this.comments.concat(result.body.message)
                    
                }else{
                    Toast("获取评论失败")
                }
            })
        },
        getmore(){
            this.pageIndex++;
            this.getcomment()
        },
        postComment(){
            // trim 是删除首尾空格
            if(this.msg.trim().length == 0)
            {
                return Toast("评论内容不能为空")
            }
            // 发表评论
            this.$http.post('api/postcomment/'+ this.$route.params.id,{ content:this.msg.trim() }).then(result =>{
                if(result.body.status == 0)
                {
                    // 拼接处评论对象
                    var cmt = { user_name: '匿名用户', add_time:Date.now(),content:this.msg.trim()}
                    this.comments.unshift(cmt)
                }
            })
        }
    },
    props:["id"]
}
</script>
<style lang="scss" scoped>
    .cmt-container{
        h3{
            font-size: 17px;
        }
        textarea{
            font-size: 14px;
            margin: 0;
            height: 85px;
        }
        .cmt-list{
            margin: 5px 0;
            .cmt-item{
                font-size: 13px;
                .cmt-title{
                    line-height: 30px;
                    background-color: #ccc;
                }
                .cmt-body{
                    line-height: 35px;
                    text-indent: 2em;
                }
            }
        }
    }
</style>